[w3c/webcomponents] Do not specify template binding syntax in spec, make configurable (#697)

Library authors and users will all have their own preferences and opinions on binding syntax,
Rather that specifying  `{{foo}}` or ${bar} within the proposal, 
the Constructor should allow the user to configure the syntax..

In the same way that angularJS supports such..
This proposal could easily getting diverted by nitpicking on such issues..

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